THSD7A and esophageal squamous cell carcinoma: Secondly, considering the differences of human (minority: Kazakh, vivo) and cell line (Eca 109 and EC 9706, vitro), tumor (this study) and non-tumor (other researches), there might be some biased results, which need a large panel of ESCC patients and cell lines with the endogenous amount of Thsd7a.